34666 ACAT Advanced Computing and Analysis Techniques in Physics Research false [["minutes", "Minutes"], ["notes", "Notes"], ["paper", "Paper"], ["poster", "Poster"], ["slides", "Slides"], ["summary", "Summary"]] CERN alina.gabriela.grigoras@cern.ch 27004 acat2008@cern.ch We are very happy to invite you to this exceptional session of the ACAT series (12th) that will mark a new turning point in the cross-fertilization of hot physics research and computing technology. False Ettore Majorana Foundation and Centre for Scientific Culture

Via Guarnotta, 26 - 91016 ERICE (Sicily) - Italy Tel: +39-0923-869133 Fax: +39-0923-869226 E-mail: hq@ccsem.infn.it

2008-11-03T08:00:00 2008-11-07T18:00:00 2008-05-23T12:37:33 2011-09-13T20:19:51 Europe/Zurich CERN federico.carminati@cern.ch acat2008@cern.ch 17 false [["minutes", "Minutes"], ["notes", "Notes"], ["paper", "Paper"], ["poster", "Poster"], ["slides", "Slides"], ["summary", "Summary"]] 3. Computation in Theoretical Physics 1 Parallel Talk CERN, ESA vladimir.ivantchenko@cern.ch CERN, ESA vladimir.ivantchenko@cern.ch LAPP Ettore Majorana Foundation and Centre for Scientific Culture

Via Guarnotta, 26 - 91016 ERICE (Sicily) - Italy Tel: +39-0923-869133 Fax: +39-0923-869226 E-mail: hq@ccsem.infn.it

2008-11-03T16:10:00 2008-11-03T16:35:00 00:25 The status of Geant4 electromagnetic (EM) physics models is presented, focusing on the models most relevant for collider HEP experiments, at LHC in particular. Recently improvements were undertaken in models for the transport of electrons and positrons, and for hadrons. Models revised included those for single and multiple scattering, ionization at low and high energies, bremsstrahlung, annihilation, scintillation and Cerenkov. Validation has been performed against experimental data. Typical results of comparisons are shown. There was a significant update of the bremsstrahlung models. This introduced a new description of the relativistic regime for electrons and positrons, which describes precisely the recent LPM experiment at CERN. New models for bremsstrahlung and electron-positron pair production by hadrons were introduced. A significant effect is observed due to the bremsstrahlung of pions is observed, affecting the signal in EM calorimeters of LHC detectors. With a focus on the LHC start-up, we discuss performance versus precision of different configurations of EM physics. slides doc http://indico.cern.ch/images/word.png word file ppt http://indico.cern.ch/images/powerpoint.png powerpoint file pdf http://indico.cern.ch/images/pdf_small.png pdf file odt http://indico.cern.ch/images/writer.png writer file odp http://indico.cern.ch/images/impress.png presentation file ods http://indico.cern.ch/images/calc.png spreadsheet file other http://indico.cern.ch/images/file_small.png unknown type file link http://indico.cern.ch/images/link.png link 2013-06-19 2013-06-20